A decision symbol represents a binary choice, such as Yes/No or True/False. Therefore, exactly two flow lines should leave the diamond-one for the condition being met and one for it not being met. When more than two outcomes are required, best practice is to cascade additional decision symbols rather than attach extra branches directly to a single diamond.
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What does the decision (diamond) symbol represent in a flowchart?
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Why are only two exit paths recommended for a decision symbol?
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How are decisions with more than two outcomes handled in flowcharts?